Broodmother

Legendary Resistance (3/Day, or 5/Day in Lair). If the Broodmother fails a saving throw, it can choose to succeed instead.

Spider Climb. The Broodmother can climb difficult surfaces, including along ceilings, without needing to make an ability check.

Web Walker. The Broodmother ignores movement restrictions caused by webs, and it knows the location of any other creature in contact with the same web.

Siphon Life. For each of the target's turns the Broodmother has the target restrained, the target takes 30 (5d10 + 5) Necrotic Damage, and the Broodmother gains hit points equal to half the roll, rounding up. The target takes an extra 10 (1d10 + 5) Necrotic Damage per turn of being restrained after the first turn. If the Broodmother takes 50 damage or more before its next turn, it will let go of the target, and they fall to the ground prone.

Bite. Melee Attack Roll: +5 , reach 30 ft. Hit: 40 (6d10 + 10) Piercing damage plus 25 (4d10+5) Poison damage, and the Broodmother picks up the target, giving them the restrained condition.

Web (Recharge 5–6). Dexterity Saving Throw: DC 18, one 10-foot sphere the spider can see within 60 feet. Failure: The target has the Restrained condition until the web is destroyed (AC 12; HP 20; Vulnerability to Fire damage; Immunity to Poison and Psychic damage).

 Pounce. As a bonus action, the Broodmother takes the dash action and uses its Bite attack.

Stomp. Melee Attack Roll: +5 , reach 30 ft. Hit: 40 (2d12 + 8) Bludgeoning damage, and the target is pushed 5 feet away.

Legendary Action Uses: 1 (3 in Lair). Immediately after another creature’s turn, the Broodmother can expend a use to take one of the following actions. The Broodmother regains all expended uses at the start of each of its turns.

Hair Cloud. The Broodmother releases its hairs in a 45 ft. sphere centered around itself. Any creatures with an AC lower than 18 take 18 (2d10 + 8) Piercing damage, have the stunned condition, and have disadvantage on attack rolls until the start of their next turn.